Incumbent Democrat Michael Bennet and his Republican challenger Ken Buck are in a virtual tie in Colorado’s U.S. Senate race as the candidates prepare for a nationally televised debate on Sunday.

The latest Rasmussen Reports telephone survey of Likely Voters in Colorado shows Buck with 47% support to Bennet’s 45%. Four percent (4%) prefer another candidate in the race, and another four percent (4%) are still undecided. (To see survey question wording, click here.)

Less than two weeks ago, Buck, a county prosecutor, held a 50% to 45% lead over Bennet, who was named to the Senate last year when Ken Salazar joined President Obama’s Cabinet. In surveys since March, Buck has earned 44% to 51% support, while backing for Bennet has ranged from 38% to 45%.

The survey of 750 Likely Voters in Colorado was conducted on October 14, 2010 by Rasmussen Reports. The margin of sampling error is +/-4 percentage points with a 95% level of confidence. Field work for all Rasmussen Reports surveys is conducted by Pulse Opinion Research, LLC. See methodology.

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